Electro Harmonix Q-TRON +
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The Essentials to Know About the Electro-Harmonix Q-Tron Plus Pedal
The Essentials to Know About the Electro-Harmonix Q-Tron Plus Pedal
- Ultra-expressive analog envelope filter: from sharp funk "quack" to softer, more vocal sweeps.
- Integrated effects loop (Send/Return) to insert drive, octaver, delay, or modulation between the preamp and the filter without disturbing the trigger dynamics.
- Selectable attack response: fast like the original Q-Tron or slower, smoother, and more "vowel-like".
- True bypass and full controls (filter modes, Q/Peak, sweep direction, gain, and boost) to tailor the effect to your playing and your guitar or bass.
Manufacturer Information
Electro Harmonix
https://www.ehx.com
info@ehx.com
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A Direct Lineage to the Golden Age of Auto-Wah
The Q-Tron Plus is part of the grand tradition of envelope filters that defined funk, fusion, and psychedelic textures. Its spirit clearly references the "touch sensitive" filters made famous by vintage circuits, with an Electro-Harmonix approach: more controls, more headroom, and a true modern pedalboard logic. Within the range, the Plus version stands out with two decisive additions for demanding musicians: a dedicated effects loop (placed at the optimal point in the internal chain) and a Response switch to choose the envelope's reaction speed.
Who Is It For, and In Which Styles?
The Q-Tron Plus is aimed at guitarists and bassists who want a lively, sensitive, and adjustable auto-wah without relying on an expression pedal. It excels in funk, soul, blues, rock, jam, fusion, and even more modern contexts (indie, electro, ambient) whenever rhythmic movement in the sound is sought. In the studio, it sculpts "speaking" attacks and highly articulated grooves; live, it delivers an immediately clear effect in the mix, especially on double-stop parts, chicken picking, or percussive bass lines.
If you play with marked dynamics (precise right hand, palm-muting, ghost notes), the envelope follower becomes a natural extension of your touch. And if your signal varies a lot (single-coil vs. humbuckers guitar, active bass, pickup changes), the gain and sweep range controls help maintain consistent triggering from one instrument to another.
Technical specifications
| Effects | Envelope / Auto-wah, Effects | Type | sector |
| Technology | Analog | Use | electric guitar |
| Format | Pedal | Color | Black |
| EQ | Tone | ||
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Questions frequently asked
Does the Q-Tron Plus work with an electric bass?
Thanks to the adjustable gain and boost switch, the envelope triggering can be adapted to bass signals, including active ones. Percussive lines and ghost notes benefit from an attack-sensitive sweep.
How to use the FX Send/Return effects loop?
The FX Send/Return loop places effects between the preamp that detects the envelope and the filter section. Distortion, octaver, or delay can be inserted without altering the initial attack detection. This architecture maintains a stable envelope drive with effects that compress the signal.
What power supply is required for this pedal?
The required power supply is 24 V DC, with a 100 mA adapter provided; the consumption is indicated as starting from 35 mA.
What is the difference between the fast and slow response settings?
The Response selector adjusts the envelope follower's reaction speed. In the fast position, the filter responds immediately to the attack; in the slow position, the sweep unfolds more gradually over the note.
What filter settings are available?
The unit offers three filter modes: low pass, band pass, and high pass. The Hi/Lo range, sweep direction (up or down), and Peak control allow adjustment of frequency and resonance.
